Designation F2403 − 09 Standard Specification for Inch Series Machine Screws, Carbon Steel, 60 000 psi Tensile Strength1 This standard is issued under the fixed designation F2403; the number immediate[.]
Trang 1Designation: F2403−09
Standard Specification for
Inch Series Machine Screws, Carbon Steel, 60 000 psi
This standard is issued under the fixed designation F2403; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision A number in parentheses indicates the year of last reapproval A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1 Scope*
1.1 This specification covers the requirements for non-heat
treated carbon steel machine screws with nominal diameters of
No 0000 through 3⁄4 in having a minimum ultimate tensile
strength of 60 000 psi
1.2 The values stated in inch-pound units are to be regarded
as standard No other units of measurement are included in this
standard
2 Referenced Documents
2.1 ASTM Standards:2
A751Test Methods, Practices, and Terminology for
Chemi-cal Analysis of Steel Products
F606/F606MTest Methods for Determining the Mechanical
Properties of Externally and Internally Threaded
Fasteners, Washers, Direct Tension Indicators, and Rivets
F788/F788MSpecification for Surface Discontinuities of
Bolts, Screws, and Studs, Inch and Metric Series
F1470Practice for Fastener Sampling for Specified
Me-chanical Properties and Performance Inspection
F1941Specification for Electrodeposited Coatings on
Threaded Fasteners (Unified Inch Screw Threads (UN/
UNR))
F2282Specification for Quality Assurance Requirements for
Carbon and Alloy Steel Wire, Rods, and Bars for
Me-chanical Fasteners
2.2 ASME Standards:3
B1.1Unified Screw Threads
B1.3MScrew Thread Gauging Systems Dimensional
Ac-ceptability Inch and Metric Screw Threads—UN UNR UNJ M MJ
B18.6.3Machine Screws and Machine Screw Nuts
B18.24Part Identifying Number (PIN) Code System Stan-dard for B18 Externally Threaded Fastener Products
B18.6.4Thread Forming and Thread Cutting Tapping Screws and Metallic Drive Screws
B18.18.2MInspection and Quality Assurance for High-Volume Machine Assembly Fasteners
2.3 Industrial Fasteners Institute:4
IFI–138Straightness Gaging Method and Straightness Lim-its for Machine, Tapping, and Thread Rolling Screws
2.4 ISO Standards:5
ISO 3269:2000Fasteners–Acceptance Inspection
2.5 National Aerospace Standards:6
NASM 1312-8Fastener Test Methods, Method 8, Tensile Strength
3 Ordering Information
3.1 Orders for machine screws under this specification shall include the following (seeNote 1):
3.1.1 ASTM specification number and date of issue, 3.1.2 Quantity (number of pieces),
3.1.3 Head style and drive (ASME B18.6.3), 3.1.4 Size (nominal diameter, threads per inch and length) (see 7.3), and
3.1.5 Stress relieve anneal, if required (see4.2)
3.1.6 Finish—Specify protective finish type, if required If
required, specify applicable coating specification, thickness, and type
3.1.7 Certification, if required (Section11)
3.1.8 Supplementary requirements, if required
3.1.9 Other special requirements, if required
3.1.10 Part Identifying Numbering (PIN) System (optional)
—Part Identifying Number will be determined in accordance
with ASME B18.24, if required
1 This specification is under the jurisdiction of ASTM Committee F16 on
Fasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,
Nuts, Rivets and Washers.
Current edition approved May 1, 2009 Published May 2009 Originally
approved in 2005 Last previous edition approved in 2006 as F2403 – 06 DOI:
10.1520/F2403-09.
2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3 Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
www.asme.org.
4 Available from Industrial Fasteners Institute (IFI), 6363 Oak Tree Boulevard Independence, Ohio 44131, www.industrial-fasteners.org.
5 Available from American National Standards Institute (ANSI), 25 W 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
6 Available from U.S Government Printing Office Superintendent of Documents,
732 N Capitol St., NW, Mail Stop: SDE, Washington, DC 20401.
*A Summary of Changes section appears at the end of this standard
Trang 2N OTE 1—A typical order description follows: ASTM F XXXX – XX,
5000 pieces; Machine Screws: Type I Cross Recessed Flat Countersunk
Head; 1 ⁄ 4 20 × 3 UNC-2A; Certifications Required.
4 Materials and Manufacture
4.1 Materials:
4.1.1 Steel for machine screws shall be made by the
open-hearth, basic-oxygen, or electric-furnace process
4.1.2 Unless otherwise specified, SpecificationF2282shall
be used for procurement control of the material used to
manufacture machine screws, except chemical composition
shall be as specified in Section5
4.2 Manufacture:
4.2.1 Unless otherwise specified, the method of
manufac-ture shall be cold forming
4.2.2 Machine screw threads shall be rolled
4.2.3 When specified by the purchaser, machine screws shall be stress relieve annealed
5 Chemical Composition
5.1 Machine screws shall have a heat analysis conforming
to the requirements specified inTable 1 5.2 The IFI Steel Grade Designations specified in the table titled Carbon Steels, Chemical Ranges and Limits, % of Specification F2282are suitable grades, providing the carbon content shall not exceed 0.29 %
5.3 Product analyses shall be permitted to be conducted on finished screws in each lot The composition thus determined shall not vary from the heat analysis by more than the allowable limits in the table titled Permissible Variations from Specified Chemical Ranges, and Limits for Carbon Steel of Specification F2282
5.4 In case of conflict or for referee purposes, the product analysis shall take precedence
5.5 Screws are customarily furnished from stock, in which case individual heats of steel cannot be identified
6 Mechanical Properties
6.1 Tensile:
6.1.1 Machine screws shall have a tensile strength of 60 000 psi minimum
6.1.2 The machine screws shall meet the tensile load re-quirements in Table 2 when tested in accordance with 10.2
using the method below
Tensile Test Requirements Head Style Nominal Size Length Hex Other than
Hex
No 0 and smaller Shorter than 3DA Not requiredB Not requiredB
Larger than No 0 Shorter than 3DA Not requiredB Not requiredB
No.1 to No 5 incl 3D and longer Axial Axial
No 6 and larger 3D and longer Wedge Axial
A
D denotes the nominal diameter.
B
Use Hardness, see 6.2 6.1.3 Tensile testing is not required unless Supplementary Requirement S1 is specified in the inquiry and order, or as stated in6.1.2
6.2 Hardness:
6.2.1 Machine screws subjected to tensile testing in accor-dance with6.1.1shall have a Rockwell Hardness of HRB 100 maximum
6.2.2 Screws that are exempted from tensile testing in accordance with6.1.2shall have a Rockwell Hardness of HRB
70 to HRB 100
6.3 Ductility—Ductility testing is not required unless
Supplementary Requirement S34 is specified in the inquiry and order
7 Dimensions
7.1 Unless otherwise specified, the dimensions shall be in accordance with the requirements of ASME B18.6.3
7.2 Gauging—Unless otherwise specified, screw threads
shall be gauged in accordance with ASME B1.3M, System 21
TABLE 1 Chemical Composition Requirements
Chemical Element Heat Analysis
Carbon, max., % 0.29
Phosphorous, max., % 0.035
Sulfur, max., % 0.040
TABLE 2 Tensile Load Requirements For Machine Screws
Nominal Size or
Basic Major Diameter
of Thread and
Threads per in.
Stress Area,
in 2 Tensile Strength,A
lb, min
No 0000-160 0.021
000-120 0.034
00-90 0.047
00-96 0.047
0-80 0.060
1 ⁄ 4 -20 0.250 0.0318 1900
1 ⁄ 4 -28 0.250 0.0364 2200
5 ⁄ 16 -18 0.312 0.0524 3150
5 ⁄ 16 -24 0.312 0.0580 3500
3 ⁄ 8 -16 0.375 0.0775 4650
3 ⁄ 8 -24 0.375 0.0878 5250
7 ⁄ 16 -14 0.438 0.1063 6400
7 ⁄ 16 -20 0.438 0.1187 7100
1 ⁄ 2 -13 0.500 0.1419 8500
1 ⁄ 2 -20 0.500 0.1599 9600
9 ⁄ 16 -12 0.562 0.182 10 900
9 ⁄ 16 -18 0.562 0.203 12 200
5 ⁄ 8 -11 0.625 0.226 13 600
5 ⁄ 8 -18 0.625 0.256 15 400
3 ⁄ 4 -10 0.750 0.334 20 100
3 ⁄ 4 -16 0.750 0.373 22 400
ATensile strength is based on 60 000 psi.
Trang 37.3 Unless otherwise specified, threads prior to plating shall
be Unified Coarse Thread Series as specified in the latest issue
of ASME B1.1 for sizes #0 through3⁄4in., and shall have Class
2A thread tolerances Thread sizes smaller than #0 shall
comply with the dimensions in the Appendix of ASME
B18.6.3
7.4 Coated or Plated Product—Unless otherwise specified,
coated and plated threads shall conform with the latest issue of
ASME B1.1 and be within the limits of Class 3A high limit (3A
GO) and the lower limit of Class 2A (2A NOGO)
7.5 Straightness—Unless otherwise specified, the
straight-ness shall be in accordance with the requirements of IFI-138
8 Workmanship, Finish, and Appearance
8.1 Workmanship—Surface discontinuities for machine
screws with nominal diameters of No 5 and larger shall
conform to the limits of Specification F788/F788M
8.2 Finish—Unless otherwise specified, the machine screws
shall be supplied with a natural (as processed) finish, unplated
or uncoated
8.3 When electrodeposited coatings are specified, they shall
be in accordance with SpecificationF1941
9 Number of Tests
9.1 Chemical—Sampling for chemical analyses shall be in
accordance with Guide F1470
9.2 Mechanical—Sample size shall conform to Guide
F1470 when lot control is applied, or to ISO 3269 when
shipping lots are applied
9.3 Dimensions—Sampling for dimensional compliance
shall be in accordance with ASME B18.18.2M, unless
other-wise specified in the referenced dimensional standard
9.4 When tests of individual lots are required prior to
shipment, Supplementary Requirement S2 shall be specified in
the inquiry and order
9.5 The requirements of this specification shall be met in
continuous mass production for stock, and the manufacturer
shall make sample inspections to ensure that the product
conforms to the specified requirements Additional tests of
individual shipments of material are not ordinarily
contem-plated
10 Test Methods
10.1 Chemical—Chemical analyses shall be performed in
accordance with Test Methods, Practices, and Terminology
A751
10.2 Tensile—Sizes No 6 and larger shall be tension tested
in accordance with Test Methods F606/F606M and sizes
smaller than Sizes No 6 in accordance with NASM 1312, Test
Number 8
10.3 Ductility—Ductility testing shall be tested in
accor-dance with the section on Ductility Test of ASME B18.6.4
10.4 Hardness—Hardness tests shall be conducted in
accor-dance with Test Methods F606/F606M For screws smaller than No 10 size, a referee test may be made at mid-radius using microhardness measurement techniques
11 Certification and Test Reports
11.1 Certification shall not be required unless specifically requested in the purchase document When specified in the purchase order, a producer certification shall be furnished to the purchaser, stating that the fastener was manufactured, sampled, tested, and inspected in accordance with this speci-fication and meets all of its requirements
12 Responsibility
12.1 The party responsible for the machine screws shall be the organization that supplies the machine screws to the purchaser
13 Product Marking
13.1 Individual hex and hex washer head machine screws with nominal diameter No 6 and up to including3⁄4in shall be marked with the manufacturer’s identification marking At the discretion of the manufacturer, other machine screw head styles can be marked with the manufacturer’s identification marking
14 Packing and Package Marking
14.1 Packaging:
14.1.1 Unless otherwise specified, packaging shall be in accordance with the manufacturers practice and shall be adequate to prevent damage during shipment
14.1.2 When the purchaser requires special packing requirements, they shall be defined at the time of inquiry and order
14.2 Package Marking:
14.2.1 Each shipping container shall include or plainly be marked with the following information:
14.2.1.1 ASTM specification and date, 14.2.1.2 Nominal diameter and length, product name, and head and drive style,
14.2.1.3 Name and brand or trademark of the manufacturer, 14.2.1.4 Number of pieces,
14.2.1.5 Purchase order number, and 14.2.1.6 Country of origin
15 Keywords
15.1 carbon steel; machine screws
Trang 4SUPPLEMENTARY REQUIREMENTS
One or more of the following supplementary requirements shall apply only when specified by the purchaser in the inquiry and order (see3.1.8) Supplemental requirements shall in no way negate any
requirement of the specification itself
S1 Tensile Testing
S1.1 When specified on the inquiry or purchase order,
tensile testing shall be performed on each lot (manufacturing or
shipping) of machine screws except those specified in 6.1.2
Tensile testing shall be performed and meet the requirements of
6.1,9.2and10.2
S2 Inspection
S2.1 When specified on the inquiry or purchase order,
machine screw shall be subject to inspection by the purchaser
at the place of manufacture This will take place prior to
shipment The manufacturer shall afford the purchaser’s rep-resentative all reasonable facilities to satisfy him that the machine screws are being furnished in accordance with this specification
S3 Ductility
S3.1 When specified on the inquiry or purchase order, ductility testing shall be performed on each lot (manufacturing
or shipping) of machine screws Ductility testing shall be performed and meet the requirements of9.2and10.3
SUMMARY OF CHANGES
Committee F16 has identified the location of selected changes to this standard since the last issue, F2403 – 06,
that may impact the use of this standard
(1)14.1.1was revised, removed reference to Practice D3951
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned
in this standard Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk
of infringement of such rights, are entirely their own responsibility.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and
if not revised, either reapproved or withdrawn Your comments are invited either for revision of this standard or for additional standards
and should be addressed to ASTM International Headquarters Your comments will receive careful consideration at a meeting of the
responsible technical committee, which you may attend If you feel that your comments have not received a fair hearing you should
make your views known to the ASTM Committee on Standards, at the address shown below.
This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,
United States Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above
address or at 610-832-9585 (phone), 610-832-9555 (fax), or service@astm.org (e-mail); or through the ASTM website
(www.astm.org) Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222
Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http://www.copyright.com/